sc1214tstr

Manufacturer Part Numbersc1214tstr
DescriptionSc1214 High Speed Combi-sense 2-phase Synchronous Mosfet Driver
ManufacturerSemtech Corporation
sc1214tstr datasheet
 
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POWER MANAGEMENT
Description
The SC1214 is a high speed, Combi-Sense
driver designed to drive high-side and low-side MOSFETs
in two synchronous Buck converters. The driver com-
bined with Combi-Sense PWM controllers, such as
Semtech SC2643VX or SC2643, provides a cost effec-
tive two-phase voltage regulator for advanced micro-
processors
The Combi-Sense
is a technique to sense the inductor
TM
current for peak current mode control of voltage regula-
tor without using sensing resistor. It provides the follow-
ing advantages:
- No costly precision sensing resistor
- Lossless current sensing
- High level noise free signal
- Fast response
- Suitable for wide range of duty cycle
The detailed explanation of the technique can be found
in the Applications Information section.
A 30ns max propagation delay from input transition to
the gate of the power FET’s guarantees operation at high
switching frequencies. Internal overlap protection circuit
prevents shoot-through from Vin to PGND in the main
and synchronous MOSFETs. The adaptive overlap pro-
tection circuit ensures the bottom FET does not turn on
until the top FET source has reached 1V, to prevent cross-
conduction.
High current drive capability allows fast switching, thus
reducing switching losses at high (up to 1.5MHz) frequen-
cies without causing thermal stress on the driver.
Under-voltage-lockout and over-temperature shutdown
features are included for proper and safe operation.
Timed latches and improved robustness are built into
the housekeeping functions such as the Under Voltage
Lockout and adaptive Shoot-through protection circuitry
to prevent false triggering and to assure safe operation.
The SC1214 is offered in a TSSOP-20 package.
May 9, 2005
Two-Phase, Synchronous MOSFET Driver
Features
u
High efficiency
, two-phase
TM
u
+12V gate drive voltage
u
High peak drive current
u
Adaptive non-overlapping gate drives provide
shoot-through protection
u
Support
Combi-Sense
u
Fast rise and fall times (15ns typical with 3000pf
load)
u
Ultra-low (<30ns) propagation delay (BG going low)
u
Floating top gate drive
u
Crowbar function for over voltage protection
u
High frequency (to 1.5 MHz) operation allows use
of small inductors and low cost ceramic capacitors
u
Under-voltage-lockout
u
Low quiescent current
Applications
u
Intel Pentium
u
AMD Athlon
TM
supplies
u
High current low voltage DC-DC converter
1
High Speed, Combi-Sense
and VID-on-fly operations
TM
processor power supplies
®
processor power
and AMD-K8
TM
s
www.semtech.com
TM

sc1214tstr Summary of contents

  • Page 1

    POWER MANAGEMENT Description The SC1214 is a high speed, Combi-Sense driver designed to drive high-side and low-side MOSFETs in two synchronous Buck converters. The driver com- bined with Combi-Sense PWM controllers, such as Semtech SC2643VX or SC2643, provides a cost ...

  • Page 2

    POWER MANAGEMENT Typical Application Circuit 2005 Semtech Corp. 2 SC1214 www.semtech.com ...

  • Page 3

    POWER MANAGEMENT Absolute Maximum Ratings Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied ...

  • Page 4

    POWER MANAGEMENT Electrical Characteristics (Cont.) Unless specified 25° 12V REG ...

  • Page 5

    POWER MANAGEMENT Timing Diagrams CO DRN PDL_BG Rising Edge Transition 2005 Semtech Corp PDH_TG R_TG 1.4V F_BG 5 SC1214 1. PDL_TG F_TG t t PDH_BG R_BG Falling Edge Transition www.semtech.com ...

  • Page 6

    POWER MANAGEMENT Pin Configurations Top View DRN1 1 20 TG1 2 19 BST1 3 18 CO1 VPN2 6 15 VIN2 7 14 VREG2 8 13 BG2 9 12 PGND 10 11 (20-Pin TSSOP) Pin Descriptions ...

  • Page 7

    POWER MANAGEMENT Block Diagram VIN1,2 CO1,2 PGND 2005 Semtech Corp. UVLO LOGIC CONTROL & OVERLAP PROT ECTION CIRCUIT 7 SC1214 LDO VREG1,2 VPN1,2 BST1,2 TG1,2 DRN1,2 BG1,2 www.semtech.com ...

  • Page 8

    ... GAGE PLANE A SEE DETAIL SIDE VIEW -A- AND - DETERMINED AT DATUM PLANE -H- DIM Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804 8 DIMENSIONS INCHES MILLIMETERS NOM MAX MIN NOM MAX - - - - .047 1. .006 ...